January 1, 122
Emperor Hadrian orders the construction of a massive defensive wall spanning 73 miles across northern Britain, marking the northernmost boundary of Roman Britain. The project employed 15,000 soldiers and took six years to complete.
January 1, 128
The Pantheon, Rome's architectural masterpiece, was reconstructed under Emperor Hadrian between 118-128 CE, featuring the world's largest unreinforced concrete dome measuring 43.3 meters in diameter.
